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Deependra M. Shakya Otega A. Ejegbavwo Thayalan Rajeshkumar Sanjaya D. Senanayake Amy J. Brandt Sharfa Farzandh Narayan Acharya Amani M. Ebrahim Anatoly I. Frenkel Ning Rui Gregory L. Tate John R. Monnier Konstantinos D. Vogiatzis Natalia B. Shustova Donna A. Chen 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(46):16685-16689
We report the first study of a gas‐phase reaction catalyzed by highly dispersed sites at the metal nodes of a crystalline metal–organic framework (MOF). Specifically, CuRhBTC (BTC3?=benzenetricarboxylate) exhibited hydrogenation activity, while other isostructural monometallic and bimetallic MOFs did not. Our multi‐technique characterization identifies the oxidation state of Rh in CuRhBTC as +2, which is a Rh oxidation state that has not previously been observed for crystalline MOF metal nodes. These Rh2+ sites are active for the catalytic hydrogenation of propylene to propane at room temperature, and the MOF structure stabilizes the Rh2+ oxidation state under reaction conditions. Density functional theory calculations suggest a mechanism in which hydrogen dissociation and propylene adsorption occur at the Rh2+ sites. The ability to tailor the geometry and ensemble size of the metal nodes in MOFs allows for unprecedented control of the active sites and could lead to significant advances in rational catalyst design. 相似文献
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